Yeah, maybe. I can't remember (from 1967) but it comes from really old
volcanoes.

Roger

http://home.insightbb.com/~derbyrm

"Richard J Kinch" wrote in message
.. .
derbyrm writes:

Cool Deck involves mixing a lot of lightweight puffy rock dust into the
plaster.

"Puffy rock dust"?

Sounds like fumed silica.